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Other Revenue - Schedule of Other Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure Of Other Revenue [Abstract]                      
Facilitation fee                 $ 2,422 $ 20,608 $ 20,410
Brand alliance fees                 3,479 621 2,641
Advertising revenue                 3,152 4,495 781
Service fees on rail reservation                 1,047 2,021 700
Miscellaneous                 3,456 8,600 3,496
Total $ 5,134 $ 4,137 $ 3,139 $ 1,146 $ 6,869 $ 8,252 $ 10,945 $ 10,279 $ 13,556 $ 36,345 $ 28,028